Telephone receiver



kwek. E?. 39251.

e3. .vsl'smsm TELEPHONE RECEIVER led Marsh yJ, 1922 m INVENTOR "irai-enla i7, l ,4 l A"lJNlflllD )sT-arias fPAriJN-TLQFEME. rimedio-nntp.;

frznnrnonn Application. uilledlhlaron 3,.-18. Serlu'l- .No.MO.

i I To allwhom t may concern."

`ilm lrovements in which the following 1sv n specification.

.Be it known .that I, CHARLES Freemen; a' citizen .of the United States, residing at'3657 Broadway, city, county, and. VState of New York, have iuventedcertain new and use ful Telephone Receivers, 0f'

My invention relates to telephone receivers andparticularly to telephonereceivers used on head sets for receiving wireless telegraph lor telephone messages, more especially the latter. c

One of the objects of my inventionis to provide a telephone receiver which canvibe my invention consists in the ments and combinations more fully pointed` carried' on th .quicklyy and cheap y manufacl parts assembled correctly and y rapidly and in whiclrthema e head of the o erator and which can be turcd and the net can be4 nmnufactured of hard steel and astencd into .the carrying case. without drilling a hole in the magnet., rand without altering-its mag' nel ic cross section. f I.

'll'ith the above and other objects inf view,

' parts, improveouthci'cinafter. v

.Referring to the drawings:` n Fifrurc 1 1s a lan view of the 'receiver with the diaphragm and cov-c1' removed;

of Fig. 1;.'

Fig. 2 .is 'a v ertlcal-,cross section on line Fig. 3 is aa'crtical cross section on lin'e :}-3 of`l1`ig. 1: l Y

Fig. 4 is' a sectional detail-'of the meansy for clamping the magnet and pole piece in registering relation:

Fig. 5 is a detail view of thc angle platecarrying -a .pole-piece and the registering i stop for one pole of the magnet;

. attache Fig. 6 is a detail view showing the clamp; and

Fig. 1. A he parts are inounted in al case l-which is preferably. round and made of brass or nomma etic material. This case can-be magnet 3 is U-shaped or arc-shaped, havin twoA poles and is made of hard steel whxc is cast or bent to lit-' e case. The magnet 7 the current entering and leaving thev coils by lead wirds 8, 9.

Each terminal isv constructed ofl a 'singlemetallic plug with an annular rim the magnets parts assume the rig. 7 is' a 'Sec-admi aan1pn1ine7`7 of/ Having thus described the 'construction theop'ertionwill 100 .ters Patent n provided with an aperture .10. into which 'n clampedin place'byA screws 11, 12. The plugs 6, 7. are vmounted lin sockets 'or secured tothe case. achplug is provided to sceurelyfhold theA` plugtin place when molded in the insulating bloc` f lMeans arev provided for assemlilinv and;

securing the coils, 'pole-pieces and ma net in place, in their correct relation, and without drilling holes into the hard steel of which Elate having a. soft irn-p i eing one plate fol' each ooilend 'the '1eA piece., formmg the cori'l for the coil. llc y gilt; at'right anglesA angle plate. carries a.`.w1

g tothe pole piece, the wing carrying a regis- 'I5 tering 'stop 17 l Each wing is notched at 18,

19 to receive the feet 20, 21 of u removable clamp 22 carrying a' clamping lip? 23. -The clamp is shown invertedinFi'g. 6.` `Screw holes 24?, 25 are vdrilled in the clamp. When 80" is placed inclam ing-position the sition s own r-Fi'gs. 1 i to 4.' After asseln ling the parts in the case, screws 26 arranged the m o'net which the bac the clamp,

insuring phragm 28 are of the usual construction.

aus o assembly,

and me Y.

for a wireless teleclear.- When used be girone receiver, the coils'4, 5 are wound of by' ear 2 to the head band. The

'e wire 'of `the necessary `highohinic': resistance. f

limited-to details and that numerous may out `departing from the principle thereof.`

desire to. by Letat l claim'and lead wine is inserted, being' A i apere0 -tures 1n the insulatin block 13 which is and! passing outside of' passthru perforations in fof the case as'slrownyin- Fig.I 3, 'en-f' ter the holes 24, 25 ofthe clamp and'tilu's I' Securely fasten 'the ma et-,the .gole-pices eposition of U0 disturbance of 'fthe magnetic circuit and thediiiculty ofdrilling are. thus -avoided."4 The screw cap 27 andsheet metal dia-A It is understood that .the invention'is'nt'lfll chans be made in carrying it into effect wi -g tion of a case, a two-pole magnet carried within the case, a pair of coils, a pair of angle plates, the upturned ends of which form cores for the said coils, said plates having wings at right angles to their ends upon which wings the' magnet arms rest, each of said Wings provided with a pair of notches, removable clamps each having a lip engaging the side of the magnet and each clamp provided with a pair of feet entering the note-hes, said feet provided with screw-holes and screws for removably securing said feet to the case. K

2.*A receiver for wireless tele hone receiveis and the like, .comprisingt e eombia lip engaging the side of the magnet and 'means for removably securing said clamps to 'said case,

3. A recelver for wlreless receiving systems and the like, comprising the combina- '-iesponding end of the magnetand means for removablyl y plate to the casing.

tion of a oase, a ;two-pole magnet carried .within the case, a pair of coils, a pair of vangle plates, the upturned ends of which form cores for the said coils, saidplates having wings at right angles to their ends upon Whichwings the magnet arms rest, each of said wings provided with -a pair of notches, and each `of said wings having a bent portion forming a stop for the end of the magnet, removable clamps each having a lip engaging the side of the magnet and each clamp provided with a pair of feetentering said notches, said feet provided with screw-holes and screws for removably securin said feet to the case.

4. wireless telephone receiver comprising'a casing, a two-polemagnet, and a telephone coil, a detachable .bent right-angled plate of soft iron having one limb forming therore for said coil, the other limb having a bent portion forming a stop for the corsecuring said magnet and 5. A magnetic receiver for wireless receivers and the like, comprising the combi! nation of a case, a magnet'earried within the case, said magnet having two ends forming the poles thereof, a pair of coils, a pair of separate detachable pole plates of magnetic material one for each pole of the magnet, each plate having a portion forming the core of one of said coils land another portion upon which the corresponding end of the said magnet rests, a detachable plate having a portion engaging the side of the magnet, said latter plate and one of said pole plates embracing the magnet end between them, a stop for one pole of the magnet carried by` 6..A magnetic receiver for wireless re-.y

ceiversand the like, comprising the combination of-a case, a magnet carried within the l case, said magnet having two ends forming the poles thereof, apair of coils, a pair of vseparate detachable pole plates of magnetic material, one for each pole of the magnet, each plate having a portion forming the core of one of said coils, and a portion on which the' end of the magnet rests, a removable clamping plate engaging the side of the. magnet, said removable ,plate providing clamp-ing means for ,clamping the magnet to the casing, a stop for one pole of the magnet carriedby one of said plates land means passingoutside of the magnet, detachable from said plates for removably securing said magnet to said case. l

7. A magnetic receiver `for wireless receivers and the like comprising the combination of a case, a magnet carried within the case, a pair of plates, one of them a pole one pole of the magnet carried'by one of y said plates, .and a screw passing outside of' the magnet for securingth'epmagnet to the case. n l

In testimony whereof, I have4 signed my vname to this specification.I

oHasJ FISCHER. 

